PROCESSOR-SDK-AM335X: SPL with device tree

Adam Hanson

I'm currently using Processor SDK Linux 03.03.00.04 U-Boot. Attempting to add driver support into the SPL for TPM functionalities, but when utilizing the device tree (CONFIG_SPL_DM with CONFIG_SPL_OF_CONTROL), I'm unable to get a console output from our board from the SPL.

Using the SPL/UBOOT without CONFIG_SPL_OF_CONTROL, the hardcoded UARTS in the board.c work perfectly to get a console for the SPL and U-Boot works fine with the same DTS and CONFIG_OF_CONTROL option. I've gone in and modified the associated DTS files to include the 'u-boot,dm-pre-reloc' in order to get the devices propagated to the SPL DTS, but the fact that I'm unable to get any console output seems to be troublesome during this hang.

Again, in the previous phase, U-Boot with a DTS and SPL standard work fine. When I try using U-Boot with a DTS and SPL with the same DTS, I receive no console feedback and the system seems to hang. Any insight on possible places to look for resolution would be greatly appreciated!

Thanks,

Adam

am335x-boneblack.dts
am33xx.dtsi

over 7 years ago

0 Kemal R. Shakir over 7 years ago

TI__Guru 55345 points

Hello Adam,

Please, try this on the latest Processor SDK.

Best regards,
Kemal

0 Adam Hanson over 7 years ago in reply to Kemal R. Shakir

Prodigy 90 points

I had avoided moving on to the latest (4.0) versions of the SDK because of known issue LCPD-10233 of the U-Boot release notes for 04.02.00:
"U-boot: Using DM_I2C in SPL is broken"

The TPM we're using is on the I2C bus. Is there a patch available for this?

0 Steve Kipisz over 7 years ago in reply to Adam Hanson

TI__Genius 15510 points

You should be able to use the latest SDK as long as your code is after i2c initialization in SPL. SPL initializes i2c so that it can read the board type from an EEPROM.

Steve K.

0 Steve Kipisz over 7 years ago in reply to Steve Kipisz

TI__Genius 15510 points

Did this solve your issue?

Steve K.

0 Adam Hanson over 7 years ago in reply to Steve Kipisz

Prodigy 90 points

Had attempted to move to a later build and confirmed that console support was available. However, switching over to use the Driver Module in the SPL with Device Tree support encumbered more issues, in particular with the MMC and getting the U-Boot image.

Your above advice helped us progress further by moving back to a previous build and communicating with the I2C and the TPM in a similar manner that the EEPROM would have been used if it was configured.

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PROCESSOR-SDK-AM335X: SPL with device tree